Aggregator

Log Number: 4505029Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Janak
DATE:             05/27/2026
SHIFT:               Day

The operator has read the following:

• ELOG
• PD Shift Plan
• Radiation Surveys for PSS Segments in Controlled Access
• PSS Log

Log Number: 4505019Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
Zone 1L10
Username: victorc
Date/Time: 05-27-26_07:47:29
RF Status: Good
Comment: C75 Unbypassed - CPS breaker reset by SME
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4505018Logbook(s): 

• BTLOG
• ELOG
• INCLOG

Entry Makers: kpriceBody: 

It seems like this BPM is ailing, and it's a likely culprit for the injector energy lock jump phenomenon. The entire dpp excursion is coming from dpp_bpm so it's definitely not a misbehaving corrector.

Edit: added another example of an injector energy jump that seems to have been driven by IPM0R07 flaking out (fig 2). In this case it recovered and we were able to turn the energy lock back on without incident.

Log Number: 4505017Logbook(s): 

• BTLOG
• ELOG

Body: 

Thank you for this reminder. I am generating a quick process (BSList) for utilizing the lock and what to do when we reach the gain limit. It is a simple matter of pausing the lock until the current is beyond the threshold and then engaging the lock after orbits have settled.

Log Number: 4505016Logbook(s): 

• ELOG
• LERFLOG

Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 05-27-26
Time : 07:29:20
Day : Wednesday
Shift : Day

Crew Chief : Blackshaw
Program Deputy: Saitiniyazi
Team : E
Arm : RadCon
Designated SSO: Humphry
LERF Operator:
Operators : Humphry, Janak

This stamp certifies that the above Crew Chief has read/reviewed/received the following:

Log Number: 4505015Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW beam to B/C/D. Lower current 

Log Number: 4505014Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

Body:  Accelerator PHYSICS STUDIES RESTORE ACC DOWN OFF (SAM) Planned 8 0 0

Log Number: 4505012Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

I couldn't say if this is related to the energy jumps, or the injector discharges, or something drifting in the chicane, or the significant difference between C and D beam positions, or...

Log Number: 4505011Logbook(s): 

• ELOG
• SRFLOG

Entry Makers: michaelmBody: 

7A pump may be contributing now too...

Log Number: 4505009Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

Log Number: 4505008Logbook(s): 

• ELOG

Entry Makers: victorc

Log Number: 4505006Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: CryoModule
User: victorc
Areas: SouthLinac NorthLinac

CryoModule Devices:
1L14
1L03
1L02
1L04
1L05
1L07
1L06
1L08
1L09
1L10
1L11
1L12
1L15
1L13
1L16
1L19
1L17
1L18
1L20
1L21
1L22
1L23
1L24
1L25
1L26
2L14
2L03
2L02
2L04
2L05
2L07
2L06
2L08
2L11
2L09
2L10
2L12
2L15
2L13
2L16
2L19
2L17
2L18
2L20
2L21
2L22
2L23
2L24
2L25
2L26

Log Number: 4505005Logbook(s): 

• POLOG
• ELOG

Body: Spot Location: (13250,18750), Charge: 58.07662399999999

Laser Wavelength Atten Setting Laser Power Current HV PS Current QE PV Updated? Update Time/Reason Not Updated (nm) (W) (uA)</T

Log Number: 4505003Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17035Title:
1L10 recovery

Summary:
Restoring 1L12 and 1L14 to compensate for 1L10 did not go as planned. Optics did not reproduce and our efforts to make it work failed.

Log Number: 4505001Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

We got in touch with RF on call about 1L10 and attempted to turn on 1L12 and 1L14 to make up the gradient. After running LEM and getting available 1L12 and 1L14 cavities phased up, we discovered the optics at 1E01 were substantially different from before the gradient shuffle. We called RF on-call again to let them know we couldn't make it work without 1L10; they're on their way and should be on site in about 30 minutes.

Log Number: 4504999Logbook(s): 

• ELOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - x Sigma: 0.4459 Peak 2 - u Sigma: 0.5954 Peak 3 - y Sigma: 0.6512

Log Number: 4504996Logbook(s): 

• ELOG

Body: 

Laser Used:

D Laser

Sigmas:

Peak 1 - x Sigma: 0.6933 Peak 2 - u Sigma: 0.9722 Peak 3 - y Sigma: 1.2518

Log Number: 4504994Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been GSET 0:
1L12-8
Username: kprice
Date/Time: 05-27-26_06:39:42
RF Status: Good
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Will need to recover 1L10 after all
Special Instructions: , HPA breaker tripped

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4504993Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been GSET 0:
1L12-7
Username: kprice
Date/Time: 05-27-26_06:39:42
RF Status: Good
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Will need to recover 1L10 after all
Special Instructions: , HPA breaker tripped

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4504992Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been GSET 0:
1L12-6
Username: kprice
Date/Time: 05-27-26_06:39:42
RF Status: Good
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Will need to recover 1L10 after all
Special Instructions: , HPA breaker tripped

Maintenance Tag: Component: Operator Entry - See SME